The problem is almost certainly moisture related. You may even want to revise your planting to save your other plants. At a glance, I'd say the culprit is that mulch: in humid, high rainfall areas, organic mulch will hold too much moisture and rot the roots of dry loving plants. If your soil is fast draining, you could simply rake away that mulch and replace it with a bit of gravel or stone; light colored will reflect light and dry the foliage off. If your soil is too heavy, your best bet is to create a slightly raised bed with edging and ammend that soil with large grit.
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